• Subject: PF File Definition questions...
  • From: Chuck Lewis <clewis@xxxxxxxxxx>
  • Date: Thu, 14 Oct 1999 14:59:42 +0100

Hi Folks !

Was wondering how folks define PF's when it comes to keyed or not.

Is there something I'm missing when it comes to NOT having the "most
common" field(s) in a PF defined in the PF a key field(s) ?

Then handle the less obvious stuff in LF's ?

One less access path...

Why PF's with NO key fields ?

Also, I was told YEARS ago (on the S/38) that you should try to keep the
number of LF's over a PF to a minimum, say 3, 4 tops and let your
program handle the level breaks, etc. to help system performance. Even
on the AS/400 there has GOT to be some truth to that just due to the
fact that there aren't a BUNCH of access paths that have to be rebuilt.
I've seen some vendor packages with a hundred LF's over one PF !!!!

Thanks !


| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com

As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.